Adding the debug bar logic in the server (#22410)

* Adding debugbar layer

* Adding sql debugbar info

* Make duration consistent across the debugbar lines

* Adding the debugbar/systeminfo endpoint

* Adding logs to the debugbar

* Improve the debugbar logger fields info

* Improving the debug bar architecture

* Allow to enable/disable debugbar in the backend

* Exposing the Debug Bar enable in the client config

* Adding more system information to the debugbar

* Adding params info to the store layer

* Organizing a bit the debugbar code in the server and adding some extra data to the system info api

* Adding debugbar email traces

* Changing the socket event name to 'debugbar'

* Adding explain support for the debugbar

* Adding missed file

* Omitting data related to the debugbar itself

* Removing unneeded functions

* Avoid arbitrary execution in explain api

* Moving debugbar inside the platform directory

* Replacing debugbar logger with a new logger Target

* Removed uneeded changes

* Fixing some linter errors

* Adding a debugbar log level to use it later for log events strictly related to the debug bar

* Fixing linter errors

* Fixing tests

* Adding i18n strings

model/debugbar.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import "runtime"
+
+type DebugBarInfo struct {
+	ServerOS             string
+	ServerArchitecture   string
+	ServerVersion        string
+	BuildHash            string
+	DatabaseType         string
+	DatabaseVersion      string
+	LdapVendorName       string
+	LdapVendorVersion    string
+	ElasticServerVersion string
+	ElasticServerPlugins []string
+	WebSocketConnections int
+	MasterDBConnections  int
+	ReadDBConnections    int
+	SessionsCount        int64
+	Goroutines           int
+	Cpus                 int
+	CgoCalls             int64
+	GoVersion            string
+	GoMemStats           runtime.MemStats
+}